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引用本文:戴娟娟,袁野平,宋浩宸.利用旋转平台模拟双河口羽流相互作用的研究.海洋与湖沼,2020,51(5):1108-1117.
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利用旋转平台模拟双河口羽流相互作用的研究
戴娟娟, 袁野平, 宋浩宸
浙江大学海洋学院 舟山 316021
摘要:
本文通过旋转平台实验室实验的方法,探讨了双河口情况下两个羽流将如何发生相互作用。在研究中,提出了一种新颖的技术对河口羽流的各切面流场进行测量,来获得河口羽流多个平面的速度场及涡度场,并基于此模拟了双河口羽流系统的准三维结构。通过对不同入流速度下的双河口羽流流场演变过程和内部结构进行了一系列对比研究,以期揭示上游河流的入流如何影响下游河口涡旋的形成及在羽流相互作用情形下各个羽流的演变。实验结果表明:随着上游入流流量的增加,上游羽流形成的沿岸流对下游河口涡旋沿岸迁移的促进和离岸输运的抑制作用将更加显著。特别是在上游入流流量等于或大于下游入流流量的情况下,下游羽流河口涡旋的体积增长明显较单一河口情况放缓。在上游入流流量较大的情况下,下游原有河口涡旋被推向更下游位置,在远离河口的位置形成另一个河口涡旋。在垂直方向上,我们可以观察到高上游入流流量条件下的下游河口涡旋的深度较小,更有利于形成三层流体的情况。本研究对多河口近海流域的营养盐及污染物的输运情况等社会和生态问题的研究有着重要的意义。
关键词:  双河口  旋转平台  分层PIV (Partical Imagery Velocimetry)技术  河口羽流  河口涡旋
DOI:10.11693/hyhz20191200248
分类号:P733
基金项目:国家自然科学基金资助项目,41876089号;国家重点研发计划,2017YFC1405100号,2016YFC1401404号;舟山市科技计划项目浙江大学海洋学院专项,2018C81034号
INVESTIGATION ON PLUME-TO-PLUME INTERACTION ON A LABORATORY-SCALE ROTATING TABLE
DAI Juan-Juan, YUAN Ye-Ping, SONG Hao-Chen
Ocean College, Zhejiang University, Zhoushan 316021, China
Abstract:
A series of double-estuary experiments were carried out in rotating table to investigate how the two plumes would interact. A novel technique was invented to measure the flow field in the cross section of estuary plume, to build the velocity field and vorticity field of plume, and to simulate the quasi three-dimensional structure of the double-estuary plume system. By analyzing a series of comparative studies on the evolution process and internal structure of the double-estuary plume under different inflow velocities, the influence of upstream river discharge on the formation of downstream bulge and the evolution of each individual plume under the plume-to-plume interaction scenario were examined. The experimental results show that with the increase of the inflow, the coastal flow formed by the upstream plume promoted the coastal transport of the downstream estuarine vortex and inhibited the offshore transport more significantly. Especially when the upstream inflow was equal to or greater than the downstream inflow, the volume growth of the downstream plume estuary vortex was significantly slower than that of the single estuary. In the case of large inflow, the original estuary vortex was pushed to the further reaches and another estuary vortex was formed far away from the estuary. In the vertical direction, we observed that the depth of the downstream estuarine vortex was smaller under the condition of high upstream inflow, which was more conducive to the formation of three-layer fluid. This study provided important information to solving social and ecological problems such as the transport of nutrients and pollutants in a multi-estuarine system and coastal basins.
Key words:  plume-to-plume interaction  rotating table  layered-PIV method  river plume  recirculating bulge
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